void UpdateHideNavigationBarSeparator()
{
bool shouldHide = NavPage.OnThisPlatform().HideNavigationBarSeparator();
// Just setting the ShadowImage is good for iOS11
if (_defaultNavBarShadowImage == null)
_defaultNavBarShadowImage = NavigationBar.ShadowImage;
if (shouldHide)
NavigationBar.ShadowImage = new UIImage();
else
NavigationBar.ShadowImage = _defaultNavBarShadowImage;
if (!Forms.IsiOS11OrNewer)
{
// For iOS 10 and lower, you need to set the background image.
// If you set this for iOS11, you'll remove the background color.
if (_defaultNavBarBackImage == null)
_defaultNavBarBackImage = NavigationBar.GetBackgroundImage(UIBarMetrics.Default);
if (shouldHide)
NavigationBar.SetBackgroundImage(new UIImage(), UIBarMetrics.Default);
else
NavigationBar.SetBackgroundImage(_defaultNavBarBackImage, UIBarMetrics.Default);
}
}
void SetStatusBarStyle()
{
var barTextColor = NavPage.BarTextColor;
var statusBarColorMode = NavPage.OnThisPlatform().GetStatusBarTextColorMode();
if (statusBarColorMode == StatusBarTextColorMode.DoNotAdjust || barTextColor.Luminosity <= 0.5)
{
// Use dark text color for status bar
UIApplication.SharedApplication.StatusBarStyle = UIStatusBarStyle.Default;
}
else
{
// Use light text color for status bar
UIApplication.SharedApplication.StatusBarStyle = UIStatusBarStyle.LightContent;
}
}
void UpdateBarTextColor()
{
var barTextColor = NavPage.BarTextColor;
var globalAttributes = UINavigationBar.Appearance.GetTitleTextAttributes();
if (barTextColor == Color.Default)
{
if (NavigationBar.TitleTextAttributes != null)
{
var attributes = new UIStringAttributes();
attributes.ForegroundColor = globalAttributes.TextColor;
attributes.Font = globalAttributes.Font;
NavigationBar.TitleTextAttributes = attributes;
}
}
else
{
var titleAttributes = new UIStringAttributes();
titleAttributes.Font = globalAttributes.Font;
// TODO: the ternary if statement here will always return false because of the encapsulating if statement.
// What was the intention?
titleAttributes.ForegroundColor = barTextColor == Color.Default
? titleAttributes.ForegroundColor ?? UINavigationBar.Appearance.TintColor
: barTextColor.ToUIColor();
NavigationBar.TitleTextAttributes = titleAttributes;
}
if (Forms.IsiOS11OrNewer)
{
var globalLargeTitleAttributes = UINavigationBar.Appearance.LargeTitleTextAttributes;
if (globalLargeTitleAttributes == null)
NavigationBar.LargeTitleTextAttributes = NavigationBar.TitleTextAttributes;
}
var statusBarColorMode = NavPage.OnThisPlatform().GetStatusBarTextColorMode();
// set Tint color (i. e. Back Button arrow and Text)
NavigationBar.TintColor = barTextColor == Color.Default || statusBarColorMode == StatusBarTextColorMode.DoNotAdjust
? UINavigationBar.Appearance.TintColor
: barTextColor.ToUIColor();
}
void UpdateTranslucent()
{
NavigationBar.Translucent = NavPage.OnThisPlatform().IsNavigationBarTranslucent();
}
void UpdateUseLargeTitles()
{
if (Forms.IsiOS11OrNewer && NavPage != null)
NavigationBar.PrefersLargeTitles = NavPage.OnThisPlatform().PrefersLargeTitles();
}
